From: Matthew Wilcox <matthew@wil.cx>
To: Guo Chao <yan@linux.vnet.ibm.com>
Cc: viro@zeniv.linux.org.uk, dchinner@redhat.com, hch@infradead.org,
jack@suse.cz, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC v4 Patch 0/4] fs/inode.c: optimization for inode lock usage
Date: Fri, 21 Sep 2012 06:17:18 -0600 [thread overview]
Message-ID: <20120921121717.GB24919@parisc-linux.org> (raw)
In-Reply-To: <1348219866-1799-1-git-send-email-yan@linux.vnet.ibm.com>
On Fri, Sep 21, 2012 at 05:31:02PM +0800, Guo Chao wrote:
> This patchset optimizes several places which take the per inode spin lock.
> They have not been fully tested yet, thus they are marked as RFC.
>
> I do limited tests after all patches applied: use two 'find' to traverse the
> filesystems and touch all files in parallel. This runs for several days in a
> virtual machine, no suspicious log appears.
Have you done any performance testing? Taking and releasing a lock which
isn't contended is not particularly expensive.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2012-09-21 12:17 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 9:31 [RFC v4 Patch 0/4] fs/inode.c: optimization for inode lock usage Guo Chao
2012-09-21 9:31 ` [PATCH 1/4] fs/inode.c: do not take i_lock on newly allocated inode Guo Chao
2012-09-21 9:31 ` [PATCH 2/4] fs/inode.c: do not take i_lock in __(insert|remove)_inode_hash Guo Chao
2012-09-21 9:31 ` [PATCH 3/4] fs/inode.c: do not take i_lock when identify an inode Guo Chao
2012-09-21 9:31 ` [PATCH 4/4] fs/inode.c: always take i_lock before calling filesystem's test() method Guo Chao
2012-09-21 12:17 ` Matthew Wilcox [this message]
2012-09-21 22:49 ` [RFC v4 Patch 0/4] fs/inode.c: optimization for inode lock usage Dave Chinner
2012-09-24 2:42 ` Guo Chao
2012-09-24 4:23 ` Dave Chinner
2012-09-24 6:12 ` Guo Chao
2012-09-24 6:28 ` Dave Chinner
2012-09-24 7:08 ` Guo Chao
2012-09-24 8:26 ` Dave Chinner
2012-09-25 8:59 ` Guo Chao
2012-09-26 0:54 ` Dave Chinner
2012-09-27 8:41 ` Guo Chao
2012-09-27 11:51 ` Dave Chinner
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